Plunger assembly and plunger type oil pump for steam flooding

The utility model discloses a plunger type oil pump for steam flooding. The plunger type oil pump comprises a pump barrel, a fixed valve group and a plunger assembly, wherein the pump barrel is provided with an internal chamber with an open upper end and an open lower end, the lower end of the pump barrel is provided with an oil inlet, the oil inlet of the pump barrel is communicated with a first oil inlet hole of the plunger assembly, the upper end of the pump barrel is provided with an oil outlet, and the oil outlet of the pump barrel is communicated with a second oil outlet hole of the plunger assembly; the fixed valve group is arranged at the lower part of the pump barrel and is used for closing or opening the oil inlet of the pump barrel; the plunger assembly does reciprocating motion in the internal chamber of the pump barrel along the vertical direction. According to the plunger type oil pump, due to the adoption of the structure, sand grains are taken out of the oil pump during the reciprocating motio